Well only a few of the old ones for the A4000D seem unbreakable, I've repaired 4 that were bricks, in that they were dead as one. My local TV repair guy wants $25 to recap them, but I can get a new mATX 500W off stupidBay for $24.95 that are dual voltage with silent fans and pop them in the original PSU case in 30 minutes looking exactly like the original. I did beef up my main A4000T with a 400W exact replacement AT, for bragging rights, but it was pulling a lot of weight and doing just fine. I have tons of nice things to say about the design of the A4KT case, PSU, and motherboard with only the center drive cage being a pain due to the cross bars and need to remove the 2 short+long cables for access.